.c-logo {
  display: inline-block;
  background-image: url('../logo.png');
}

.exchange-prize-btn1 {
  background-image: url('../images/ui_liwu_pifu.png');
  background-size: 100%;
}

.exchange-prize-btn2 {
  background-image: url('../images/ui_liwu_Qbi.png');
  background-size: 100%;
}

.exchange-prize-btn3 {
  background-image: url('../images/ui_liwu_gengduo.png');
  background-size: 100%;
}

.ui_guangbotubiao {
  background-image: url('../images/ui_guangbotubiao.png');
  background-repeat: no-repeat;
  background-position: 30upx center;
  background-size: 30upx;
}